River Thames, London, UK. Thermogram of a tourist (pink, right) looking out across the River Thames to the London Eye (circular shape). A boat carrying people is at centre left. A thermogram shows the variation in temperature on the surface of an object, measured by the long-wave infrared radiation it emits. The temperature scale is colour-coded and runs from blue (coldest) through green, yellow and orange and red to pink (warmest).
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